instance.c

   1 #include <sys/types.h>
   2 #include <sys/socket.h>
   3 #include <net/if.h>
   4 #include <unistd.h>
   5
   6 #include "procd.h"
   7 #include "service.h"
   8 #include "instance.h"
   9
  10 enum {
  11         INSTANCE_ATTR_COMMAND,
  12         INSTANCE_ATTR_ENV,
  13         INSTANCE_ATTR_DATA,
  14         INSTANCE_ATTR_NETDEV,
  15         __INSTANCE_ATTR_MAX
  16 };
  17
  18 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
  19         [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
  20         [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
  21         [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
  22         [INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
  23 };
  24
  25 struct instance_netdev {
  26         struct blobmsg_list_node node;
  27         int ifindex;
  28 };
  29
  30 static void
  31 instance_run(struct service_instance *in)
  32 {
  33         struct blobmsg_list_node *var;
  34         struct blob_attr *cur;
  35         char **argv;
  36         int argc = 1; /* NULL terminated */
  37         int rem;
  38
  39         blobmsg_for_each_attr(cur, in->command, rem)
  40                 argc++;
  41
  42         blobmsg_list_for_each(&in->env, var)
  43                 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
  44
  45         argv = alloca(sizeof(char *) * argc);
  46         argc = 0;
  47
  48         blobmsg_for_each_attr(cur, in->command, rem)
  49                 argv[argc++] = blobmsg_data(cur);
  50
  51         argv[argc] = NULL;
  52         execvp(argv[0], argv);
  53         exit(127);
  54 }
  55
  56 void
  57 instance_start(struct service_instance *in)
  58 {
  59         int pid;
  60
  61         if (in->proc.pending)
  62                 return;
  63
  64         in->restart = false;
  65         if (!in->valid)
  66                 return;
  67
  68         pid = fork();
  69         if (pid < 0)
  70                 return;
  71
  72         if (!pid) {
  73                 instance_run(in);
  74                 return;
  75         }
  76
  77         DPRINTF("Started instance %s::%s\n", in->srv->name, in->name);
  78         in->proc.pid = pid;
  79         uloop_process_add(&in->proc);
  80 }
  81
  82 static void
  83 instance_timeout(struct uloop_timeout *t)
  84 {
  85         struct service_instance *in;
  86
  87         in = container_of(t, struct service_instance, timeout);
  88         kill(in->proc.pid, SIGKILL);
  89         uloop_process_delete(&in->proc);
  90         in->proc.cb(&in->proc, -1);
  91 }
  92
  93 static void
  94 instance_exit(struct uloop_process *p, int ret)
  95 {
  96         struct service_instance *in;
  97
  98         in = container_of(p, struct service_instance, proc);
  99         DPRINTF("Instance %s::%s exit with error code %d\n", in->srv->name, in->name, ret);
 100         uloop_timeout_cancel(&in->timeout);
 101         if (in->restart)
 102                 instance_start(in);
 103 }
 104
 105 void
 106 instance_stop(struct service_instance *in, bool restart)
 107 {
 108         if (!in->proc.pending)
 109                 return;
 110
 111         kill(in->proc.pid, SIGTERM);
 112 }
 113
 114 static bool
 115 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 116 {
 117         if (!in->valid)
 118                 return true;
 119
 120         if (!blob_attr_equal(in->command, in_new->command))
 121                 return true;
 122
 123         if (!blobmsg_list_equal(&in->env, &in_new->env))
 124                 return true;
 125
 126         if (!blobmsg_list_equal(&in->data, &in_new->data))
 127                 return true;
 128
 129         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 130                 return true;
 131
 132         return false;
 133 }
 134
 135 static bool
 136 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 137 {
 138         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 139         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 140
 141         return n1->ifindex == n2->ifindex;
 142 }
 143
 144 static void
 145 instance_netdev_update(struct blobmsg_list_node *l)
 146 {
 147         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 148
 149         n->ifindex = if_nametoindex(n->node.avl.key);
 150 }
 151
 152 static bool
 153 instance_config_parse(struct service_instance *in)
 154 {
 155         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 156         struct blob_attr *cur, *cur2;
 157         int argc = 0;
 158         int rem;
 159
 160         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 161                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 162
 163         cur = tb[INSTANCE_ATTR_COMMAND];
 164         if (!cur)
 165                 return false;
 166
 167         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 168                 return false;
 169
 170         blobmsg_for_each_attr(cur2, cur, rem) {
 171                 argc++;
 172                 break;
 173         }
 174         if (!argc)
 175                 return false;
 176
 177         in->command = cur;
 178
 179         if ((cur = tb[INSTANCE_ATTR_ENV])) {
 180                 if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 181                         return false;
 182
 183                 blobmsg_list_fill(&in->env, blobmsg_data(cur), blobmsg_data_len(cur), false);
 184         }
 185
 186         if ((cur = tb[INSTANCE_ATTR_DATA])) {
 187                 if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 188                         return false;
 189
 190                 blobmsg_list_fill(&in->data, blobmsg_data(cur), blobmsg_data_len(cur), false);
 191         }
 192
 193         if ((cur = tb[INSTANCE_ATTR_NETDEV])) {
 194                 struct blobmsg_list_node *ndev;
 195
 196                 if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 197                         return false;
 198
 199                 blobmsg_list_fill(&in->netdev, blobmsg_data(cur), blobmsg_data_len(cur), true);
 200                 blobmsg_list_for_each(&in->netdev, ndev)
 201                         instance_netdev_update(ndev);
 202         }
 203
 204         return true;
 205 }
 206
 207 static void
 208 instance_config_cleanup(struct service_instance *in)
 209 {
 210         blobmsg_list_free(&in->env);
 211         blobmsg_list_free(&in->data);
 212         blobmsg_list_free(&in->netdev);
 213 }
 214
 215 static void
 216 instance_config_move(struct service_instance *in, struct service_instance *in_src)
 217 {
 218         instance_config_cleanup(in);
 219         blobmsg_list_move(&in->env, &in_src->env);
 220         blobmsg_list_move(&in->data, &in_src->data);
 221         blobmsg_list_move(&in->netdev, &in_src->netdev);
 222         in->command = in_src->command;
 223         in->name = in_src->name;
 224         in->node.avl.key = in_src->node.avl.key;
 225         in->config = in_src->config;
 226         in_src->config = NULL;
 227 }
 228
 229 bool
 230 instance_update(struct service_instance *in, struct service_instance *in_new)
 231 {
 232         bool changed = instance_config_changed(in, in_new);
 233
 234         if (!changed)
 235                 return false;
 236
 237         in->restart = true;
 238         instance_stop(in, true);
 239         instance_config_move(in, in_new);
 240         return true;
 241 }
 242
 243 void
 244 instance_free(struct service_instance *in)
 245 {
 246         uloop_process_delete(&in->proc);
 247         uloop_timeout_cancel(&in->timeout);
 248         instance_config_cleanup(in);
 249         free(in);
 250 }
 251
 252 void
 253 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
 254 {
 255         in->srv = s;
 256         in->name = blobmsg_name(config);
 257         in->config = config;
 258         in->timeout.cb = instance_timeout;
 259         in->proc.cb = instance_exit;
 260
 261         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
 262         blobmsg_list_simple_init(&in->env);
 263         blobmsg_list_simple_init(&in->data);
 264         in->valid = instance_config_parse(in);
 265 }
 266
 267 void instance_dump(struct blob_buf *b, struct service_instance *in)
 268 {
 269         void *i;
 270
 271         i = blobmsg_open_table(b, in->name);
 272         blobmsg_add_u8(b, "running", in->proc.pending);
 273         if (in->proc.pending)
 274                 blobmsg_add_u32(b, "pid", in->proc.pid);
 275         blobmsg_add_blob(b, in->command);
 276         blobmsg_close_table(b, i);
 277 }